I just use a simple hard round brush. I usually set the opacity to 50% and the flow to 10%. I change a little bit these settings during the painting process, but this is where I start from and I always come back to this.
And yes, I keep the same brush to draw and to paint.

I always tried to find a great brush to improve my paintings, but I learned that we can do good stuff without fancy brushes. After I took the Schoolism course with Bobby Chiu, I realized that keeping in mind how the lights or the colors will work with a good structure base is more important than find the perfect brush.
Of course a lot of brushes can help a lot and bring nice effects to the painting, and saving time as well, but I don't have experience with this kind of process. I want to learn, I will try brushes when I can, but right now I'm focused in learning structure and lighting, and color after that. =]

I hope I could help.
See ya.

__________________
"Every passing minute is another chance to turn it all around."

Pay attention to the actual reach of your light sources. On Death, you have highlights in areas that the light source cannot reach, such as on the collarbone. The ankh also looks like there's no distinct material property--we can't tell if it's made of metal, plastic, bone, or whatever.

Delirium's hair can look a bit more natural at the top. It looks like a big lump of dough right now instead of hair. Define the layers of strands that add up to that big pile on top so it looks more like hair.

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